Method of forming apertured plates



Oct. 22, 1929. c. P. EISENHAUER METHOD OF FORMING APERTURED PLATES FiledJuly 21, 1927 Fig.1.

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m YA E P 3 w R m 0 Patented Oct. 22, 1929 i UNITED STATES PATENT OFFICECHARLES P. IEISENI'IAUER, OF DAYTON, OHIO, ASSIGNOB TO THE DURO COMPANY,OF

DAYTON, OHIO, A CORPORATION OF OHIO METHOD OF FORMING APERTURED PLATESApplication filed July 21,

My invention relates to a method of forming apertured plates.

It is the object of my invention to provide a method of forming anapertured plate and a resulting plate in which the plate will haveformed extremely fine slots therein.

Heretofore it has been impossible to form a plate with extremely fineslots due to the fact that the thickness of the cut-ting implement tocut the slot provided an irreducible minimum of diameter of the slot.Such cutting implements at best are very delicate and incapable ofquantity production to form foraminous bodies.

It is my object to providea resulting foraminous plate by my methodhereinafter described.

Referring to the drawings:

Figure 1 is an edge View of a plate which is used for stock.

Figure 2 is a section showing the result of the first operation ofpressing the metal outwardly causing it to tear along a given line.

Figure 8 is a section showing the outwardly pressed portion condensedand pressed back upon its own axis.

Figure 4: is a section showing the pressedout portion which has been socondensed re stored to its original horizontal position so that a verynarrow slot has been formed witlv out the use of any cutting or punchingtool.

Figure 5 is a diagrammatic view of the punch and dies utilized for thisoperation showing them in position to act upon the metal as it is formedin Figure 2 to bring about the results in Figures 5 and 1.

Figure (3 is a view of a plate showing the slots made according to thepresent method.

It will be understood in referring to the drawings that the particulardiagrammatic illustration of the punch and die to be utilized is forillustration only and that any desired form of mechanism may be employedfor carrying out my method.

This method consists of the following steps:

I first take a sheet of metal designated 1 and punch out a portiondesignated 2, fracturing it or tearing italong the line 3 by the outwardpressure on the portion 2. I do not 1927. Serial nofeozesa use any meansof cutting the metal, merely relying upon the pressure of the punch anda supporting mandrel (not shown) beneath the portion 1 to cause asevering of the metal along the line of shear.

I then apply pressure to the face 5 of the portion 2 to reduce theoverall length of the left-hand half of the plate preferably condensingthe metal by reason of the pressure applied at 5 in the area generallydesignated 6. I then restore by suitable pressure the two halves of thesheet so that they are on the same plane with one another, as in Figure1, leaving between them a very narrow slot designated 7, the size ofwhich is exaggerated in the drawing.

This invention may be performed by different means and different devicesmay be used for that purpose. There is shown in the accompanyingdrawings, in Figure 5, a preferred form for carrying out the purposesand the results and steps of this invention.

In this figure there are shown two stationary supports, indicated bynumerals 18 and 19, which afford a horizontal surface for supporting theplate to be operated upon. This plate in this figure is indicated by thenumerals 41 and 17.

Situated above the stationary supports 18 and 19 are two yielding diemembers, indicated by the numerals l2 and 16. These die members areresiliently held in engagement with the upper surface of the plate andcooperate with the stationary supports 18 and 19 in holding the plateduring the process of operation.

These stationary supports 18 and 19 and the yielding die members 1.2 and16 are situated adjacent each other in such a way as to provide a spacefor the guidance of a die member 8 and a punch member 15.

The upper surface of the die member 8 is inclined as indicated by thenumeral 10, and has on one edge thereof a cutting edge, indicated by thenumeral 8. This die member 8 is adapted to move up and down between thestationary supports 18 and 19, and when the plate is located in theposition shown in Figure 5 and the die 8 is forced up, the cutting edge8 engages the plate the numeral 3.

As a part of the plate 2 is pushed upward it passes by a lip 13 on theyielding die member 12. This lip 13 is located so that the free edge ofthe plate 2 will just pass it and partly smooth the torn edge of thepressed-up part 6. lVhile the die 8 is being pushed up to make a slot inthe plate, the punch 15 rises, all the time resting upon the uppersurface of the part of the plate immediately over the die 8.

After the plate has been punched to the form shown in Figure 5, theplunger 15 is forced down to cause the struck-up part of the plate to beforced in line with the original part of the plate, and being thusforced down, the end of the struck-up part of the plate 2 slides overthe lip 13 and is in sliding thereover further compressed lengthwise andmade smooth and somewhat reduced from the original size so that when theparts are in line with each other again there is a small opening betweenthe surface, indicated by the numeral 3, and that of its correspondingpart that has been struck up.

The lip 13 forms with the yielding die member 12 a notch, as is clearlyshown in Figure 5. The first operation of part of the plate is struckup, as indicated in Figure 2, leavingthe edges torn or serrated. WVhilethe plate is struck up by means of the cutting edge 8 the parts are notcut or severed, but are really broken or torn apart, leaving the'edgesroughened, as indicated in Figure 2.

However, the continued rising of the die member8 causes the surface 3 tobecome more or less smooth, due to the action of the die on the brokensurface, and when the direction of the die and the punch is changed sothat the punch bears upon the part 2 of the plate, the serrated or cutedge passes over the part of the lip 13 and is smoothed and compressedand somewhat reduced so that when the part 2 of the plate is broughtinto line with the plate 4:, as shown in Figure 5, the severed partsleave a very small opening.

The purpose of this device is to cut or form in sheets of metal smallopenings for the purpose of draining and forming plates that act assieves. A device of this kind is especially useful in softening water,where the hole must be sufficiently large to permit the passage of waterbut to prevent the passage of salts or solids supported by a screen or.plate constructed in the method here defined.

It will be understood that I desire to comprehend within my inventionsuch modifications as may be necessary to adapt it to varyingconditions. and uses.

Having thus fully described my invention what I claim as new and desireto secure by Letters Patent is:

1. In a method of forming a slotted plate, pushing a portion of theplate outwardly to shear it from its adjacent portion, applying pressureto the exposed end thus pushed out, and restoring the pushed-out portionto its former level in the plate and at the same time pressing the faceof the pushed-outportion whereby a slot is formed between the end of thepushed-out portion and the portion of the plate from which thepushed-out portion was sheared.

2. In a method of forming a slotted plate, moving one portion of theplate with respect to the other to cause such portions of the metal toshear and separate, and simultaneously condensing and returning theportion so moved to its initial position adjacent to the portion fromwhich it was sheared to form a slot therebetween.

3. In a method of forming a slotted plate, yieldingly holding said platein position, pushing out a portion of the plate to cause a shear alongthe line, and simultaneously forcing the sheared portions away from oneanother and restoring the sheared portions to their initial adjacentpositions in the same plane.

4. In a method of forming a slotted plate, rupturing the metal along agiven line, and simultaneously spreading and restoring the rupturedparts to their initial plane.

5. In a method of forming a slotted plate. shearing one portion of theplate with respect to another by moving one portion thereof laterallywith respect to another, and simultaneously applying pressure to theedges of the sheared portions and restoring the sheared portions totheir initial plane, whereby the faces of the sheared portions areadjacent to one another.

In testimony whereof, I ailix my signature.

- CHAS. P. EISENHAUER.

